Item No : 8164671 Gemstone Type : Natural Burma Gray Blue Star Sapphire Approx. Weight (ct) : 1.55 Cts. Shape : Oval Size/Dimension : 7 x 6 MM Depth : 3.5 MM Color : Gray Blue Clarity : Opaque Luster : Good Origin : Burma Hardness : 9 Specific Gravity : 3.9 - 4.1 Refractive Index : 1.76 - 1.78 Chemical Composition : Al203 Treatment : Unheated Natural